With Instagram, the focus is on the present tense.

When people say that college isn't worthwhile and paying all this money isn't worthwhile, I really disagree. I think those experiences and those classes that may not necessarily seem applicable in the moment end up coming back to you time and time again.

In my fourth grade classroom, I even instituted a government structure, because I was really interested in people having positions and there being law.

What people tell you and how they act is very, very different sometimes.

The world runs on luck.

Every startup should address a real and demonstrated need in the world. If you build a solution to a problem lots of people have, it's so easy to sell your product to the world.

People interact with their phones very differently than they do with their PCs and I think that when you design from the ground up with mobile in mind, you create a very different product than going the other way.